Sock



FIG. 1 is a top view of a sock showing our new design;

FIG. 2 is a bottom view thereof;

FIG. 3 is a top perspective view of the sock in use condition;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The broken lines showing of a sock is included for the purpose of illustration only and forms no part of the claim design. All surfaces not shown form no part of the claimed design. 

The ornamental design for a sock, as shown and described. 